SNMP & PHP Help!

I am using ipplan on my FC6 box, and when I attempt to get the routing tables from router using SNMP, I get an error message that confuses me, and havent been able to dig anything up on it yet. Hopefully someone can point me in the right direction.

The error is;
compile php with --with-snmp --enable-ucd-snmp-hack

Is this something that is done on one of the PHP pages in the program, or done in a conf file for PHP?